<template>
   <div>
       <!-- 面包屑导航区域 -->
       <el-breadcrumb separator-class="el-icon-arrow-right">
           <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
           <el-breadcrumb-item>商品管理</el-breadcrumb-item>
           <el-breadcrumb-item>添加商品</el-breadcrumb-item>
       </el-breadcrumb>
       
       <!-- 卡片视图 -->
       <el-card>
           <!-- 提示区域 -->
            <el-alert title="添加商品信息" type="info" show-icon center :closable="false"></el-alert>
            <!-- 步骤条区域 -->
            <el-steps :space="200" :active="Number(activeIndex)" finish-status="success" align-center>
                <el-step title="基本信息"></el-step>
                <el-step title="商品参数"></el-step>
                <el-step title="商品属性"></el-step>
                <el-step title="商品照片"></el-step>
                <el-step title="商品内容"></el-step>
                <el-step title="商品完成"></el-step>
            </el-steps>

            <!-- tab栏区域 -->
            <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px" label-position="top">
                <el-tabs v-model="activeIndex" :tab-position="'left'" :before-leave="beforeTabLeave" @tab-click="tabClicked">
                    <el-tab-pane label="基本信息" name="0">
                        <el-form-item label="商品名称" prop="goods_name">
                            <el-input v-model="addForm.goods_name"></el-input>
                        </el-form-item>
                        <el-form-item label="商品价格" prop="goods_price">
                            <el-input v-model="addForm.goods_price" type="number"></el-input>
                        </el-form-item>
                        <el-form-item label="商品重量" prop="goods_weight">
                            <el-input v-model="addForm.goods_weight" type="number"></el-input>
                        </el-form-item>
                        <el-form-item label="商品数量" prop="goods_number">
                            <el-input v-model="addForm.goods_number" type="number"></el-input>
                        </el-form-item>
                        <el-form-item label="商品分类" prop="goods_cat">
                            <el-cascader
                                expand-trigger="hover"
                                :options="cateList"
                                :props="cateProps"
                                v-model="addForm.goods_cat"
                                @change="handleChange">
                            </el-cascader>
                        </el-form-item>
                    </el-tab-pane>
                    <el-tab-pane label="商品参数" name="1">
                        <!-- 渲染表单的Item项 -->
                        <el-form-item :label="item.attr_name" v-for="item in manyTableData" :key="item.attr_id">
                            <!-- 复选框组 -->
                            <el-checkbox-group v-model="item.attr_vals">
                                <el-checkbox v-for="(cb, i) in item.attr_vals" :label="cb" :key="i" border></el-checkbox>
                            </el-checkbox-group>
                        </el-form-item>
                    </el-tab-pane>
                    <el-tab-pane label="商品属性" name="2">
                        <el-form-item :label="item.attr_name" v-for="item in onlyTableData" :key="item.attr_id">
                            <el-input v-model="item.attr_vals"></el-input>
                        </el-form-item>
                    </el-tab-pane>
                    <el-tab-pane label="商品图片" name="3">
                        <!-- action 表示图片要上传到的后台API地址 -->
                        <el-upload
                            :action="uploadURL"
                            :on-preview="handlePreview"
                            :on-remove="handleRemove"
                            :headers="headerObj"
                            :on-success="handleSuccess"
                            list-type="picture">
                            <el-button size="small" type="primary">点击上传</el-button>
                            <div slot="tip" class="el-upload__tip">只能上传jpg/png文件，且不超过500kb</div>
                        </el-upload>
                    </el-tab-pane>
                    <el-tab-pane label="商品内容" name="4">
                        <!-- 富文本编辑器组件 -->
                        <quill-editor 

                            v-model="addForm.goods_introduce">
                        </quill-editor>
                        <!-- 添加商品按钮 -->
                        <el-button type="primary" class="btnAdd" @click="addGoods">添加商品</el-button>
                    </el-tab-pane>
                </el-tabs>
            </el-form>
       </el-card>

       <!-- 图片预览 -->
       <el-dialog
            title="图片预览"
            :visible.sync="previewDialogVisible"
            width="50%">
            <img :src="previewPath" alt="" class="previewImg">
        </el-dialog>

   </div>
</template>

<script>
import _ from 'lodash';

export default {
    name: 'Add',
    data() {
        return {
            activeIndex: '0',
            // 添加商品的表单数据对象
            addForm: {
                goods_name: '',
                goods_price: 0,
                goods_weight: 0,
                goods_number: 0,
                // 商品所属的分类数组
                goods_cat: [],
                // 图片的数组
                pics: [],
                // 商品详情描述
                goods_introduce: '',
                attrs: []
            },
            addFormRules: {
                goods_name: [
                    { required: true, message: '请输入商品名称', trigger: 'blur' },
                ],
                goods_price: [
                    { required: true, message: '请输入商品价格', trigger: 'blur' },
                ],
                goods_weight: [
                    { required: true, message: '请输入商品重量', trigger: 'blur' },
                ],
                goods_number: [
                    { required: true, message: '请输入商品数量', trigger: 'blur' },
                ],
                goods_cat: [
                    { required: true, message: '请输入商品数量', trigger: 'blur' },
                ]
            },
            // 商品分类列表
            cateList: [],
            cateProps: {
                value: 'cat_id',
                label: 'cat_name',
                children: 'children'
            },
            // 动态参数列表数据
            manyTableData: [],
            // 静态属性列表数据
            onlyTableData: [],
            // 上传图片的URL地址
            uploadURL: 'http://127.0.0.1:8888/api/private/v1/upload',
            // 图片上传组件的headers请求头对象
            headerObj: {
                Authorization: window.sessionStorage.getItem('token')
            },
            previewPath: '',
            previewDialogVisible: false,
        }
    },
    created() {
        this.getCateList()
    },
    methods: {
        // 获取所有商品分类数据
        async getCateList() {
            const { data: res } = await this.$http.get('categories')
            // console.log(res);
            if(res.meta.status === 200) {
                this.cateList = res.data
                // console.log(this.cateList);
            }else {
                return this.$message.error('获取商品分类数据失败！')
            }
        },
        handleChange() {
            // console.log(this.addForm.goods_cat);
            if(this.addForm.goods_cat.length !== 3) {
                this.addForm.goods_cat = []
            }
        },
        // 
        beforeTabLeave(activeName, oldActiveName) {
            // console.log(activeName, oldActiveName);
            // return false;
            if(oldActiveName === '0' && this.addForm.goods_cat.length !== 3) {
                this.$message.error('请先选择商品分类')
                return false;
            }
        },
        async tabClicked() {
            // console.log(this.activeIndex);
            if (this.activeIndex === '1') {
                const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes`,
                    {
                        params: { sel: 'many' }
                    }
                )
                // console.log(res);
                if (res.meta.status === 200) {
                    res.data.forEach(item => {
                        item.attr_vals = item.attr_vals.length === 0 ? [] : item.attr_vals.split(' ')
                    })
                    this.manyTableData = res.data
                    console.log(this.manyTableData);
                } else {
                    return this.$message.error('获取动态参数列表失败')
                }
            }else if(this.activeIndex === '2') {
                const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes`,
                    {
                        params: { sel: 'only' }
                    }
                )
                if (res.meta.status === 200) {
                    // console.log(res);
                    this.onlyTableData = res.data;
                } else {
                    return this.$message.error('获取静态属性失败')
                }
            }
        },
        // 处理图片预览效果
        handlePreview(file) {
            console.log(file);
            this.previewDialogVisible = true;
            this.previewPath = file.response.data.url;
        },
        // 处理移除图片的操作
        handleRemove(file) {
            console.log(file);
            // 1. 获取将要删除的图片的临时路径
            const filePath = file.response.data.tmp_path
            // 2. 从pics 数组中，找到这个图片对应的索引值
            const index = this.addForm.pics.findIndex(x => x.id === filePath)
            // 3. 调用数组的splice方法，把图片信息对象，从pics数组中删除
            this.addForm.pics.splice(index, 1)
            // console.log(this.addForm);
        },
        // 监听图片上传成功的事件
        handleSuccess(response) {
            console.log(response);
            // 1. 拼接得到一个图片信息对象
            const picInfo = { pic: response.data.tmp_path } 
            // 2. 将图片信息对象，push到pics数组中
            this.addForm.pics.push(picInfo)
            console.log(this.addForm);
        },
        // 添加商品
        addGoods() {
            // console.log(this.addForm);
            this.$refs.addFormRef.validate(async valid => {
                if (valid) {
                    // 执行添加的业务
                    // lodash  深拷贝cloneDeep(obj)
                    var form = _.cloneDeep(this.addForm);
                    form.goods_cat = form.goods_cat.join(',');
                    // 处理动态参数
                    this.manyTableData.forEach(item => {
                        const newInfo = {
                            attr_id: item.attr_id,
                            attr_value: item.attr_vals.join(' ')
                        }
                        this.addForm.attrs.push(newInfo)
                    })
                    // 处理静态属性
                    this.onlyTableData.forEach(item => {
                        const newInfo = {
                            attr_id: item.attr_id,
                            attr_value: item.attr_vals
                        }
                        this.addForm.attrs.push(newInfo)
                    })
                    form.attrs = this.addForm.attrs
                    console.log(form);
                    // 发起请求，添加商品
                    // 商品的名称必须是唯一的
                    const { data: res } = await this.$http.post('goods', form)
                    console.log(res);
                    if(res.meta.status === 201) {
                        this.$message.success('添加商品成功！')
                        this.$router.push('/goods')
                    }else {
                        return this.$message.error('添加商品失败！')
                    }
                }else {
                    return this.$message.error('请填写必要的表单项！')
                }
            })
        }
    },
    computed: {
        cateId() {
            if(this.addForm.goods_cat.length === 3) {
                return this.addForm.goods_cat[this.addForm.goods_cat.length - 1]
            }
            return null
        }
    }
};

</script>

<style lang="less" scoped>
.el-checkbox {
    margin: 0 10px 0 0 !important
}
.previewImg {
    width: 100%;
}
.btnAdd {
    margin-top: 15px;
}
</style>
